1 //===-- X86TargetFrameLowering.h - Define frame lowering for X86 -*- C++ -*-==// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This class implements X86-specific bits of TargetFrameLowering class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H 15 #define LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H 16 17 #include "llvm/Target/TargetFrameLowering.h" 18 19 namespace llvm { 20 21 class MCSymbol; 22 class X86TargetMachine; 23 class X86Subtarget; 24 25 class X86FrameLowering : public TargetFrameLowering { 26 public: X86FrameLowering(StackDirection D,unsigned StackAl,int LAO)27 explicit X86FrameLowering(StackDirection D, unsigned StackAl, int LAO) 28 : TargetFrameLowering(StackGrowsDown, StackAl, LAO) {} 29 30 /// Emit a call to the target's stack probe function. This is required for all 31 /// large stack allocations on Windows. The caller is required to materialize 32 /// the number of bytes to probe in RAX/EAX. 33 static void emitStackProbeCall(MachineFunction &MF, MachineBasicBlock &MBB, 34 MachineBasicBlock::iterator MBBI, DebugLoc DL); 35 36 void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB, 37 MachineBasicBlock::iterator MBBI, 38 DebugLoc DL) const; 39 40 /// emitProlog/emitEpilog - These methods insert prolog and epilog code into 41 /// the function. 42 void emitPrologue(MachineFunction &MF) const override; 43 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 44 45 void adjustForSegmentedStacks(MachineFunction &MF) const override; 46 47 void adjustForHiPEPrologue(MachineFunction &MF) const override; 48 49 void processFunctionBeforeCalleeSavedScan(MachineFunction &MF, 50 RegScavenger *RS = nullptr) const override; 51 52 bool 53 assignCalleeSavedSpillSlots(MachineFunction &MF, 54 const TargetRegisterInfo *TRI, 55 std::vector<CalleeSavedInfo> &CSI) const override; 56 57 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 58 MachineBasicBlock::iterator MI, 59 const std::vector<CalleeSavedInfo> &CSI, 60 const TargetRegisterInfo *TRI) const override; 61 62 bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 63 MachineBasicBlock::iterator MI, 64 const std::vector<CalleeSavedInfo> &CSI, 65 const TargetRegisterInfo *TRI) const override; 66 67 bool hasFP(const MachineFunction &MF) const override; 68 bool hasReservedCallFrame(const MachineFunction &MF) const override; 69 70 int getFrameIndexOffset(const MachineFunction &MF, int FI) const override; 71 int getFrameIndexReference(const MachineFunction &MF, int FI, 72 unsigned &FrameReg) const override; 73 74 int getFrameIndexOffsetFromSP(const MachineFunction &MF, int FI) const; 75 int getFrameIndexReferenceFromSP(const MachineFunction &MF, int FI, 76 unsigned &FrameReg) const override; 77 78 void eliminateCallFramePseudoInstr(MachineFunction &MF, 79 MachineBasicBlock &MBB, 80 MachineBasicBlock::iterator MI) const override; 81 82 private: 83 /// convertArgMovsToPushes - This method tries to convert a call sequence 84 /// that uses sub and mov instructions to put the argument onto the stack 85 /// into a series of pushes. 86 /// Returns true if the transformation succeeded, false if not. 87 bool convertArgMovsToPushes(MachineFunction &MF, 88 MachineBasicBlock &MBB, 89 MachineBasicBlock::iterator I, 90 uint64_t Amount) const; 91 }; 92 93 } // End llvm namespace 94 95 #endif 96